Now you can capture dramatic Hubble-like CCD images of emission nebulas from the heart of the city or under a full Moon. How? By imaging with the Orion S-II, O-III, and H-alpha extra-narrowband "line" filters. These specialized filters transmit only the specific wavelengths of light that are important in emission nebulas, while blocking out all other light, whether artificial or natural — from street lamps, the Moon, you name it! The result: high-contrast tricolor images from even grossly light-polluted skies.

The Orion O-III filter passes light at the 500.7nm wavelength (the Oxygen-III line) with very high 90% transmission and a bandpass of 7nm. It complements Orion H-alpha and Sulfur-II extra-narrowband filters, which together allow advanced tricolor imaging of emission nebulas with Orion monochrome imaging cameras or similar monochrome cameras.

These 1.25" astrophotography filters are made from high-grade glass and feature vacuum-deposited dichroic interference coatings and antireflection coatings. All three are parfocal, meaning no refocusing is needed when switching among them. Each filter is held in an anodized aluminum cell that is threaded to fit a standard CCD camera 1.25" nosepiece or an Orion multiple filter wheel.

Images taken with extra-narrowband filters typically look much different from those acquired using standard "true color" (RGB) methods. Rather than rendering an image in its "natural" color, the extra-narrowband filters provide a visual representation of the elemental makeup of a nebula, highlighting with assigned colors the areas where the light derives predominantly from either Sulfur-II, Oxygen-III, or Hydrogen-alpha ions. This is the approach used by astronomers for many of the nebula pictures taken with the Hubble Space Telescope. The extra-narrowband "false color" images, while beautiful, also reveal much about the chemical composition of the nebula and its various features.

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.

Warning

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Orders received by 1pm Eastern Time for in-stock items ship the same business day. Orders received after 1pm will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

To easily transition filters for tri-color RGB or LRGB astrophotography, just load up to 7 filters into the Orion Nautilus Motorized Filter Wheel and use the control software to change filters automatically.

For producing striking, high-contrast color CCD astrophotography of emission nebulae with a monochrome CCD camera, you should use extra-narrowband filters. The 1.25" Orion Extra-Narrowband Hydrogen-Alpha filter is one of a set of three filters.

For producing striking, high-contrast color CCD astrophotography of emission nebulae with a monochrome CCD camera, you should use extra-narrowband filters. The 1.25" Orion Extra-Narrowband Sulfur-II filter is one of a set of three narrowband filters.

At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Visit the Orion Community Center for in-depth information on telescopes, binoculars, and astrophotography. You can find astrophotography "how to" tips and share your best astronomy pictures here. Submit astronomy articles, events, and reviews, and even become a featured Orion customer!